Interaction of silane with 10-MDP on affecting surface chemistry and resin bonding of zirconia

Shu Ye; Shu-Fen Chuang; Sheng-Shu Hou; Jui-Che Lin; Li-Li Kang; Yung-Chung Chen

doi:10.1016/j.dental.2022.02.014

Interaction of silane with 10-MDP on affecting surface chemistry and resin bonding of zirconia

Dent Mater. 2022 Apr;38(4):715-724. doi: 10.1016/j.dental.2022.02.014. Epub 2022 Mar 3.

Authors

Shu Ye¹, Shu-Fen Chuang², Sheng-Shu Hou³, Jui-Che Lin³, Li-Li Kang⁴, Yung-Chung Chen⁵

Affiliations

¹ School of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
² School of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Stomatology, National Cheng Kung University Hospital, Tainan, Taiwan. Electronic address: sfchuang@mail.ncku.edu.tw.
³ Department of Chemical Engineering, National Cheng Kung University, Taiwan.
⁴ School of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Institute of Manufacturing Information and Systems, National Cheng Kung University, Taiwan.
⁵ School of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Stomatology, National Cheng Kung University Hospital, Tainan, Taiwan.

PMID: 35249744
DOI: 10.1016/j.dental.2022.02.014

Abstract

Objective: To investigate the effect of silane contents on their chemical interaction with 10-methacryloyloxydecyl-dihydrogen phosphate (MDP), and affecting the bonding of MDP to zirconia by time-of-flight secondary ion mass spectrometry (TOF-SIMS) and solid-state nuclear magnetic resonance (SSNMR) spectroscopy.

Methods: Zirconia (Cercon ht, Dentsply) slabs were prepared and fully sintered. Experimental primers SE-5 and SE-10 were formulated by adding 5 wt% and 10 wt% γ-methacryloxypropyltrimethoxysilane to an MDP-based primer SE BOND (SE), respectively. SE, SE-5, and SE-10 were applied on the assigned zirconia slabs. The chemical compositions on the surface and adhesive interfaces were examined by TOF-SIMS in a depth-profiling mode. Hydrophilicity and resin affinity of treated zirconia were analyzed. The bond strengths to resin cylinder were examined either after 24-h storage or thermocycles. In addition, zirconia powders treated with three primers were assessed by SSNMR spectrometry for the adsorption of MDP.

Results: TOF-SIMS analysis showed that SE treatment generated the greatest amount of P-O-Zr related ions, which reduced in SE-5 and SE-10 groups. The 3D ion-images illustrated the generation of ZrO₂(OH)^- ions with silane contents. The SSNMR analysis revealed that the chemical bonding was mainly P-O-Zr ionic bonds in SE but shifted to P-OH-Zr hydrogen bonds in SE-5 and SE-10. SE-5 and SE-10 treated zirconia presented higher hydrophilicity and affinity to resin compared to Zr did. SE showed the highest initial bond strength which significantly decreased after thermocycling.

Significance: MDP adsorption onto zirconia via P-O-Zr ionic bond promotes bonding with resin. The silane enhances the hydroxylation of zirconia and impairs the adsorption of MDP, but does not adversely affect the bond durability.

Keywords: Bonding; MDP; Silane; Solid-state nuclear magnetic resonance spectrometry; Time-of-flight secondary ion mass spectrometry; Zirconia.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Dental Bonding*
Materials Testing
Methacrylates / chemistry
Resin Cements
Shear Strength
Silanes*
Surface Properties
Zirconium / chemistry

Substances

Methacrylates
Resin Cements
Silanes
methacryloyloxydecyl dihydrogen phosphate
Zirconium
zirconium oxide